<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<script>
		document.addEventListener('click', fn, false) // 先执行 -- this 指向document
		document.addEventListener('click', fn1, false) // 后执行
		function fn () {
			alert(this);
		}
		function fn1 () {
			alert(1);
		}
	</script>
</body>
</html>